PHOTOTACTIC ORIENTATION BY THE CILIATE, STENTOR COERULEUS |
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| Authors: | Pill-Soon Song Donat-P Häder † Kenneth L Poff |
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| Institution: | Michigan State University-Department of Energy Plant Research Laboratory, Michigan State University, East Lansing, MI 48824, USA |
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| Abstract: | Stentor coeruleus exhibits negative phototaxis to visible light, in addition to a step-up photophobic response. The negative phototaxis was established by demonstrating the swimming of Stentor toward a focused beam away from the light source. The action spectrum showed a maximum at 610–620 nm and is essentially identical to that of the step-up photophobic response. Proton uncouplers such as micromolar concentrations of FCCP and TPMP+ inhibited the negative phototaxis. |
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